The wall barrier powerup makes a VERY loud noise when it is destroyed and having 3 set up at once, destructing at the same time, and wearing headphones is absolutely deafening. The volume for its self-destruct sequence needs to be lowered by a lot!

All outdoor areas look like this.
And it's only stronghold, no other wad.

gl_compatibility must be turned off in order to properly play the wad. Also, you may want to redownload the file in order to verify that its integrity was not compromised during the transfer. This is also a side effect of gl portals or skyboxes being disabled, but AFAIK that's not a config-saved variable so it should not affect things.

Spoiler: Zen Sarcasm

1. Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me, either. Just pretty much leave me the hell alone.
2. The journey of a thousand miles begins with a broken fan belt and a leaky tire.
3. It's always darkest before dawn. So if you're going to steal your neighbor's newspaper, that's the time to do it.
4. Don't be irreplaceable. If you can't be replaced, you can't be promoted.
5. No one is listening until you fart.
6. Always remember that you're unique. Just like everyone else.
7. Never test the depth of the water with both feet.
8. If you think nobody cares if you're alive, try missing a couple of car payments.
9. Before you criticize someone, you should walk a mile in their shoes.That way, when you criticize them, you're a mile away and you have their shoes.
10. If at first you don't succeed, skydiving is not for you.
11. Give a man a fish and he will eat for a day. Teach him how to fish, and he will sit in a boat and drink beer all day.
12. If you lend someone $20 and never see that person again, it was probably worth it.
13. If you tell the truth, you don't have to remember anything.
14. Sex is like air. It's not important unless you aren't getting any.
15. Don't squat with your spurs on.
16. Some days you're the bug; some days you're the windshield.
17. Don't worry; it only seems kinky the first time.
18. Good judgment comes from bad experience, and a lot of that comes from bad judgment.
19. The quickest way to double your money is to fold it in half and put it back in your pocket.
20. A closed mouth gathers no foot.
21. Duct tape is like the Force. It has a light side and a dark side, and it holds the universe together.
22. There are two theories to arguing with women. Neither one works.
23. Generally speaking, you aren't learning much when your lips are moving.
24. Experience is something you don't get until just after you need it.
25. Never miss a good chance to shut up.
26. We are born naked, wet and hungry, and get slapped on our behind. Then things get worse.
27. Never, under any circumstances, take a sleeping pill and a laxative on the same night.
28. There is a fine line between "hobby" and "mental illness."
29. No matter what happens, somebody will find a way to take it too seriously.
30. There comes a time when you should stop expecting other people to make a big deal about your birthday...around age 12.
31. Everyone seems normal until you get to know them